libs-base/Source/GetDefEncoding.m

/* Function to determine default c string encoding for
   GNUstep based on GNUSTEP_STRING_ENCODING environment variable.

   Copyright (C) 1997 Free Software Foundation, Inc.

   Written by: Stevo Crvenkovski <stevo@btinternet.com>
   Date: December 1997

   This file is part of the GNUstep Base Library.

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or (at your option) any later version.

   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with this library; if not, write to the Free
   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/


#include <stdio.h>
#include <stdlib.h>
#include <Foundation/NSString.h>
#include <Foundation/NSBundle.h>

struct _strenc_ {NSStringEncoding enc; char *ename;};
const unsigned int str_encoding_table_size = 17;
const struct _strenc_ str_encoding_table[]=
{
  {NSASCIIStringEncoding,"NSASCIIStringEncoding"},
  {NSNEXTSTEPStringEncoding,"NSNEXTSTEPStringEncoding"},
  {NSJapaneseEUCStringEncoding, "NSJapaneseEUCStringEncoding"},
  {NSISOLatin1StringEncoding,"NSISOLatin1StringEncoding"},
  {NSCyrillicStringEncoding,"NSCyrillicStringEncoding"},
  {NSUTF8StringEncoding,"NSUTF8StringEncoding"},
  {NSSymbolStringEncoding,"NSSymbolStringEncoding"},
  {NSNonLossyASCIIStringEncoding,"NSNonLossyASCIIStringEncoding"},
  {NSShiftJISStringEncoding,"NSShiftJISStringEncoding"},
  {NSISOLatin2StringEncoding,"NSISOLatin2StringEncoding"},
  {NSWindowsCP1251StringEncoding,"NSWindowsCP1251StringEncoding"},
  {NSWindowsCP1252StringEncoding,"NSWindowsCP1252StringEncoding"},
  {NSWindowsCP1253StringEncoding,"NSWindowsCP1253StringEncoding"},
  {NSWindowsCP1254StringEncoding,"NSWindowsCP1254StringEncoding"},
  {NSWindowsCP1250StringEncoding,"NSWindowsCP1250StringEncoding"},
  {NSISO2022JPStringEncoding,"NSISO2022JPStringEncoding "},
  {NSUnicodeStringEncoding, "NSUnicodeStringEncoding"}
};

NSStringEncoding GetDefEncoding()
{
  char *encoding;
  unsigned int count;
  NSStringEncoding ret,tmp;
  NSStringEncoding *availableEncodings;

  availableEncodings = [NSString availableStringEncodings];

  encoding = getenv("GNUSTEP_STRING_ENCODING");
  if(encoding)
  {
    count=0;
    while((count<str_encoding_table_size)&
         strcmp(str_encoding_table[count].ename,encoding))
    {
      count++;
    }
    if(!(count==str_encoding_table_size))
    {
      ret= str_encoding_table[count].enc;
      if((ret==NSUnicodeStringEncoding) ||
          (ret==NSSymbolStringEncoding))
      {
        fprintf(stderr, "WARNING: %s - encoding not supported as default c string encoding.\n", encoding);
        fprintf(stderr, "NSASCIIStringEncoding set as default.\n");
        ret=NSASCIIStringEncoding;
      }
      else /*encoding should be supported but is it implemented?*/
      {
        count=0;
        tmp=0;
        while(!(availableEncodings[count]==0))
        {
          if(!(ret==availableEncodings[count]))
            tmp=0;
          else
	  {
            tmp=ret;
	    break;
	  }
          count++;
        };
        if(!tmp)
        {
          fprintf(stderr, "WARNING: %s - encoding not yet implemented.\n", encoding);
          fprintf(stderr, "NSASCIIStringEncoding set as default.\n");
          ret=NSASCIIStringEncoding;
        };
      };
    }
    else /* encoding not found */
    {
      fprintf(stderr, "WARNING: %s - encoding not supported.\n", encoding);
      fprintf(stderr, "NSASCIIStringEncoding set as default.\n");
      ret=NSASCIIStringEncoding;
    }
  }
  else /* envirinment var not found */
  {
    /* This shouldn't be required. It really should be in UserDefaults - asf */
    //fprintf(stderr,"WARNING: GNUSTEP_STRING_ENCODING environment variable not found\n");
    //fprintf(stderr, "NSASCIIStringEncoding set as default.\n");
    ret=NSASCIIStringEncoding;
  }
  return ret;
};

NSString*
GetEncodingName(NSStringEncoding encoding)
{
  char* ret;
    unsigned int count=0;
  while((count<str_encoding_table_size)&
         !(str_encoding_table[count].enc == encoding))
  {
    count++;
  }
  if(!(count==str_encoding_table_size))
    ret= str_encoding_table[count].ename;
  else ret="Unknown encoding";
  return [NSString stringWithCString:ret];
};